This update addresses the "USB Devices May Not Work After You Unplug a Downstream USB Hub from the Host Controller" issue in Windows XP, and is discussed in Microsoft Knowledge Base (KB) Article 810400. Download now to use USB devices after unplugging a downstream USB hub from the host controller.

This tool checks your computer for infection by specific, prevalent malicious software (including Blaster, Sasser, and Mydoom) and helps to remove the infection if it is found. Microsoft will release an updated version of this tool on the second Tuesday of each month.

Download and run the Windows 7 Upgrade Advisor to see if your PC is ready for Windows 7. It scans your hardware, devices, and installed programs for known compatibility issues, gives you guidance on how to resolve potential issues found, and recommends what to do before you upgrade.